To understand the ecological effects of large herbivores, it is important to understand foraging behaviour and how this is affected by density. In this experiment, domestic sheep (Ovis aries) were kept at high (80 sheep ...

To test if dispersers use odour to discriminate between familiar and unfamiliar individuals male and female root voles (Microtus oeconomus) were given the opportunity to choose between one familiar and one unfamiliar test ...

It is stated that the feral American mink (Mustela vison), an introduced predator to Europe, have seriously affected local densities of birds breeding in coastal areas. I studied the effect of mink removal on breeding ...

Population sizes of large carnivores have increased in Scandinavia during the last century. Increases in predator population sizes can affect prey populations not only through increased mortality, but also through behavioural ...

Snow leopards (Uncia uncia) inhabit the remote mountain ranges of the Himalayas, and are
currently listed as Endangered. Due to their inaccessible habitat and sparse distribution it is
difficult to compile exact estimates ...

During three subsequent reproductive seasons with contrasting food availability, the King Penguin Aptenodytes patagonicus responses were monitored in a small colony at Husvik, South Georgia. Observations of metal flipper ...

Abstract
In the recent decades large carnivores have started to recolonize former occupied areas in North America and in Europe. Increases in predator population sizes can affect the whole ecosystem functioning, but little ...

Abstract
A lot of studies have been performed on demographic changes in ungulate population due to density dependence, but little is done on density dependent changes in foraging behaviour which can be a mechanism of such ...

Abstract
The heterospecific attraction hypothesis suggests that migrants cue on residents with similar ecological needs to find suitable breeding sites, and that they have reproductive fitness benefits from doing so. In ...

The aim of this study was to investigate to what extent population density and small scale
habitat variability affect somatic growth of resident, stream-living brown trout Salmo
trutta. There is an ongoing debate whether ...

The red deer (Cervus elaphus) are among the most important game species in Norway, with a tenfold increase in harvest over the last few decades. Despite its importance, information regarding red deer habitat selection is ...

Understorey vegetation changes between 1997 and 2005 were studied using 100 permanent plots (1 m2) in four boreal spruce forest stands situated within a National Nature Reserve in SE Norway. The stands differed with respect ...

Great tit nestlings won’t thrive in nests of the pied flycatcher, even though the opposite has been proven successful.
In order to explore some of the reasons why, we performed cross fostering experiments where great tit ...

Breeding habitat-choice in two closely related species of passerines, Great Tit (Parus major) and Blue Tit (Cyanistes caereleus) was studied to reveal if their habitat preferences primarily is a hereditary trait, or if ...

1. Many studies have dealt with home range and migratory patterns of Cervid species, but there are few explicit analyses quantifying migratory patterns and home range size as a result of habitat. Red deer is known to perform ...

In my experiment I studied domestic chicks (Gallus gallus domesticus) to find out how different sounds and colours affect their behaviour in a feeding process. Previous studies have found the wasp’s buzzing to be a negatively ...

Summary
The anti-predatory behaviour displayed by female Great Tit (Parus major) and Blue Tit (Cyanistes caereleus) in the nestbox was studied to observe possible differences in response between the species, and also ...

Many fish stocks today are declining due to the heavy harvesting and the increasingly demand for more food caused by the growing human population. Life-history trait as age and size at maturity are affected, the fish are ...

An upper Ordovician (upper Sandbian) benthic Paleozoic fauna at Langesund in the Oslo graben area has been reviewed. The study area consisted of the uppermost 13 meters of sediments in the Fossum Formation. A species/plot ...